Imagine a truly respectable and amiable hen, by some portentous anomaly, taking to reflection and inventing combinations by which she might prevail on Hodge not to wring her neck, or send her and her chicks to market; the result could hardly be other than much cackling and fluttering.
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We consider the accident an anomaly — not a reason to change standard procedures.
They rate a nuclear event from 1 (an anomaly) to 7 (a major accident).